Cutting-tool.



Patented Apr. l0, |900. H HILL y CUTTING TQL.

No. 647,537;y

(No Model.)

STATES PATENT CUTTING-Tool..

SPECIFICATION forming part f Letters Patent N0. 647,137, dated April 10,1900.

Application filed .Tune 14, 1897. Serial No. 640,684. (No model.)

T0 coll whom it nea/y concern:

Be it known that I, HUGH HILL, a citizen of the United States, residingat Anderson, in the county of Madison and State of Indiana, haveinvented a new and useful Cutting-Tool, of which the following is aspecification.

My invention relates to cutting-tools for turning-lathes, andparticularly to tool-holders which are so constructed with relation tothe blades as to insure the rigidity of the latter when supported in thetool-post of a lathe, planer, or similar machine; and the objects inview are to simplify and improve the construc-` tion of devices of thisclass, to provide a tool adapted to cut close to shoulders or chuckjaws,the blade and holder being constructed without lateral projections, andto provide a construction and arrangement adapted to eX- clude cuttingsfrom the joints between the connected parts.

Further objects and advantages of this invention will appear in thefollowing description, and the novel features thereof will beparticularly pointed out in the appended claims.

In the drawings, Figure l is a perspective view of an offsetcutting-tool constructed in accordance with my invention. Fig. 2 is aside view, partly in section, of the same. Fig. 3 is an end view. Fig. 4is a transverse secr tion taken in the plane of the set-screw. Fig. 5

is a detail view in perspective of the clamp detached. Fig. 6 is adetail View in perspective of the end of the holder with the blade andclamp omitted.

Similar numerals of reference indicate corresponding parts in all theligures of the drawings.

The holder of the tool embodying my invention comprises a shank l,adapted to be engaged with a tool-post of a lathe, planer, or similarmachine and provided with aparallelsided angularly-disposed reducedprojection or horn 2, which, in common with the contiguous end of theshank, is grooved to forma seat and within which is secured a bit ortool 4. The tool and seat are preferably angular in cross-section, andthe ends of the tool may be cut olf or beveled at dierent angles to formcutting edges, and thereby render the tool reversible. The projection orhorn 2 is of less thickness than the body of the shank,

whereby shoulders 5 are provided at the base of the horn, said shouldersbeing arranged in a plane at an angle to the shank of the tool, but atright angles to the beveled end thereof and provided with a seat, andabove the upper edge of the horn the shank is cut away in the plane ofsaid inclined shoulders, as indicated at 6.

The means which I employ for securing the blade in its place in thehalf-seat provided in the end of the shank consists of a clamp having ayoke 7, adapted to receive the horn or projection, and a set-screw 8,threaded in the yoke and adapted to bear terminally against the upperedge of the horn. The outer or front end of the yoke is providedinteriorly with a half-seat 9, also corresponding cross sectionally withone-half of the cross-section of the blade and adapted to register withthe portion of the half-seat 3 in the front edge of the horn orprojection to complete the seat provided for the reception of the blade.The

yoke is open at itsfront and rear edges and is flush at its front edgewith the extremity of the horn or projection to exclude cuttings fromthe yoke, and the thickness of the yoke corresponds with the projectionof the shoulders 5 at the base of the horn, whereby the side surfaces ofthe yoke are'tlush with the corresponding surfaces of the shank.

By making the sides of the yoke parallel with each other, so as to tclosely against the parallel sides of the horn, the tendency of the toolto rotate axially within its seat when its edge is in engagement withthe material being operated upon is prevented and a much more rigidconstruction is secured than if the walls of the horn were inclinedtoward each other and the arms of the yoke correspondingly inclined. Asthe shoulders upon which the lower edges of the yoke rest are at rightangles to the seat the draw or pull of the yoke will clamp the toolsecurely in its seat, and the engagement of the sides of the yoke withthe shoulders will prevent the possibility of the end thrust upon thetool causing the yoke to move downwardly upon the horn and let the toolslip in its seat therein, as might occur if the edges of the yoke werenot supported by the shoulders. Still another advantage secured by theshoulders is in avoiding the projection of the yoke be- IOO yond thesides of the shank of the tool. This permits the edge of the tool beingmoved closer to the parts of the machine or the Work than could be doneif the sides of the yoke projected beyond the sides of the shank of theholder.

From the above description it will be seen that in addition tosimplicity the tool possesses an advantage in point of compactness, thesame being of equal thickness throughout from the rear end of the shankto the outer extremity ot' the horn or projection. Furthermore, byconstructing the horn or projection of a length from the plane of theshoulders at its base equal to the Width of the yoke of the clampcuttings are excluded from -the interior`of the yoke without the use ofauxiliary devices.

The yoke of the clamp is open at its opposite sides, and being ofuniform cross-sectional area it is reversible, whereby either edgethereof may be arranged uppermost to lie iush With the extremity of thehorn. This provides for inverting the yoke when that edge which has beenuppermost has become roughened or injured by continued use to such anextent as to allow dust and cuttings to accumulate around the end of thehorn.

Having described my invention, what I claim is- I. As a new article ofmanufacture, a toolholdcr, one end of which is beveled in two planes atright angles to each other and is provided with a parallelsided hornprojecting from one of the planes With its outer face forming anextension of the other plane, said beveled portion and its extensionbeing provided with a tool-seat, and the sides of the horn being at adistance from the sides of the shank of the holder.

2. In a tool-holder, the combination with a shank, one end of which isbeveled in two planes at right angles to each other and provided with aparallel-sided horn extending from one of the planes, the outer face ofsaid horn forming an extension of the other plane and being provided inconnection therewith with a tool-seat, the sides of the holderlying at adistance from the sides ot' the shank a-nd forming shoulders, of areversible yoke, the sides of which are parallel with each other and ofthe same thickness as and resting upon the shoulders of the shank, oneof the wallsV of the yoke being provided with a tool-seat and the otherWall being provided with a screw-threaded opening, and a set-screw insaid opening.

In testimony that I claim the foregoing .as my own I have hereto aflixedmy signature in the presence of two witnesses.

' IIUGII IIILI..

Vitn esses:

F. J. HILL, M. Rno'ron,

